Snow Blocks are a common obstacle in Shovel Knight: Treasure Trove and Shovel Knight Pocket Dungeon that the protagonist must clear to progress.
In Treasure Trove, Snow Blocks appears as either a 1x1, 2x1, 2x2, 3x2, or 3x3 block with white color. Like a regular Dirt Block, it only requires 1 strike to clear, Shovel Dropping or Shoulder Bashing on it will cause Shovel Knight/King Knight to bounce/spin. These blocks are exclusive to Stranded Ship and some of its sub-levels like Frigid Flight, Slippery Summit and Spinwulf Sanctuary.
In Pocket Dungeon, Snow Blocks require 3 strikes to be broken, same amount as Stone Blocks. They are only found in Stranded Ship Dungeon and during Polar Knight's boss fight.